Audio Record Edit Toolbox is a complete audio editor.
You can use this program to perform most of the tasks you will have to do when editing audio. With it, you can take any sound file, and modify it by adding many types of effects, such as echo, distortion, delay, etc.
You will be able to add your own voice to the sound file, as well as sound from another file. The "Text to Speech" feature will add a synthesized voice that will reproduce the text you want to include. You can also add audio tracks from audio CDs. You can edit the ID3 tag for the track you are editing, resample it, merge audio files and perform a frequency analysis.
Audio Record Edit Toolbox offers an "Import from Video" feature, that will let you batch extract the audio from many video files, and save the extracted audio to the most popular sound formats.
Another feature offered by this program allows to download videos from YouTube, by entering its URL. You can choose which quality you want for your downloaded videos. Once the download is finished, you can convert the video to any of the most popular video formats.
You can evaluate this program free of charge for thirty days. But you will not be able to save your project till you register the software. But the program will save the audio extracted from videos even in the trial version.